Class | 5-10 | 10-15 | 15-20 | 20-25 |
frequency | 5 | 6 | 15 | 10 |
Class | 25-30 | 30-35 | 35-40 | 40-45 |
frequency | 5 | 4 | 2 | 2 |
Answer:
19.5
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